I had that thing with Webair ages ago.
I had one domain hosted for a temp development project and the month i moved the domain to a dedicated machine at rackspace the fuckers charged my cc for $800 bandwith. (virtually no
visitors beside people related to my company).
Didnt have much time to go into that and just cancelled the account feeling nice about being screwed for the first time.
The months after, they started charging random figures
i didnt even notice at first ($20 etc) and 4 months
later they did a $300+ charge.
I had to fucking block my CC to stop those motherfuckers
from charging.
WEBAIR